function toggle_infotext (v) {
    if (v) {
        document.getElementById('pz_infotext_close').style.display = 'none';
        document.getElementById('pz_infotext_open').style.display = 'block';
    } else {
        document.getElementById('pz_infotext_close').style.display = 'block';
        document.getElementById('pz_infotext_open').style.display = 'none';
    }
}

function showshortform () {
    document.getElementById('pz_shortformdisplay_close').style.display = 'block';
    document.getElementById('pz_shortformdisplay_open').style.display = 'none';
}

function goBack () {
    if (document.referrer != '') {
        window.location.href = document.referrer;
        return false;
    } else {
        return true;
    }
}